Well cementing device



Nov. 30, 1937. H. G. CAMPBELL WELL CEMENTING DEVICE Filed Sept. 1, 1936 a um .v 4

Inventor By 9mm Attorneys Patented Nov. 30, 1937 UNITED STATES WELL CEMENTING DEVICE Harry G. Campbell, Charleston, W. Va., assignoi" to United Pipe & Supply Corporation, Charleston, W. ,Va.

Application September 1, 1936, Serial No. 98,963

4 Claims. (Cl. 166-19) This invention appertains to new and useful improvements in means for cementing wells.

The principal object of the present invention is to provide an apparatus which can be lowered into drilled wells to the end that the inside of the well can be sprayed with cement.

Another important object of the invention is to provide a well cementing apparatus which will be positive-acting and not susceptible to the ready development of defects.

Other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawing:-

Figure 1 represents a side elevational view of. the device with a portion broken away.

Fig. 2 represents a longitudinal sectional view through the upper section of the device.

Fig. 3 represents a longitudinal sectional view through the lower section.

Fig. 4 represents a fragmentary vertical sectional view showing the valve.

Fig. 5 is a top plan view of the upper section.

Fig. 6 is a sectional view through the weight.

Referring to the drawing wherein like numerals designate like parts, it can be seen that the barrel of the device is divided into the upper tubular section 5, the lower tubular section 6 and the connecting sleeve 1. The lower portion of the upper section 5 is reduced as at 8 for engagement into the sleeve I, while the upper portion 9 of the section 6 is reduced for engagement to the lower portion of the sleeve 1.

The sleeve 1 can be of any length desired, and has the opening l therein through which cement is placed to fill up the barrel.

The lower end of the section 6 is internally threaded for receiving the plug II which has the prop I2 on the bottom thereof. Adjacent the plug H, the section 6 has discharge portions IS.

The upper section is provided with a pair of vertically extending slots M. Cross member l5 projects into these-slots. A reduced shank I6 is provided with ratchet-like ribs I1, and extends upwardly from the section 5 and has the port l8 disposed therethrough. A slot 19 extends downwardly through the shoulder 20 and in thisis mounted the rockable latch member 2 l the lower end of which can be set against the collar 22 on the upper end of the elongated rod 23 which at its lower edge has a tubular valve 24 secured thereto. This valve 24 normally closes the discharge port l3. A spring 25 is interposed be-' tween the cross member l5 and the collar 22,

as shown in Fig. 1, so that when latch lever 2i is releasedby the weight member 26, the spring 25 will force the rod upwardly removing the valve 24 from the ports l3, allowing cement to pass from the barrel and into the well.

It is to be understood that this tool is used to spray a thin coat of liquid cement on the wall of an oil or gas well to prevent loose formation or cavings from falling into the well. The cement hardens and leaves a thin hard crust of cement on the wall of. the well which holds the loose formation in place.

The device is lowered into the well on a wire line. The line is preferably threaded through the top of the tool and preferably secured by a swivel. The liquid cement can now be poured into the device through the opening Ill. The rod 23 is pulled down with a setting tool, which sets the valves, closing the ports l3. The latch element 2| holds the valve in place when the same is set against the nut 22.

The weight is held at the surface on the lowering line until the tool is lowered to the desired depth in the hole. Only a portion of an oil or gas well will have a loose formation that will require spraying. This is the reason it is necessary to have the trip or latch to release the valve at any depth in the hole. When the sprayer has reached the desired depth, the weight 26 is released so that it slides down the line and operates the trip 2| thus the valve element carried by the rod 23 is released so that it moves upwardly while at the same time cement can spray out through the opening l3.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes, in the shape, size and materials, may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

1. A cementing device for'wells comprisingan elongated barrel, the barrel being provided with discharge ports at the lower portion thereof, a valve in the barrel normally closing the ports, a rod extending from the valve, spring means associated with the rod for urging the rod in a direction removing the valve from the ports, and trip means for the rod.

2. A cementing device for wells comprising an elongated barrel, the barrel being provided with discharge ports at the lower portion thereof, a valve in the barrel normally closing the ports, a rod extending from the valve, spring means associated with the rod for urging the rod in a direction removing the valve from the ports, trip means for the rod, said. trip means consisting of. a pivotal latch member for engaging one end of the rod.

3. A cementing device for wells comprising an elongated barrel, the barrel being provided with discharge ports at the lower portion thereof, a valve in the barrel normally closing the ports, a rod extending from the valve, spring means associated with the rod for urging the rod in a direction removing the valve from the ports, trip means for the rod, and a removable plug in the lower end of the barrel.

4. A cementing device for wells comprising an elongated barrel, the barrel being provided with discharge ports at the lower portion thereof. a valve in the barrel normally closing the ports, a rod extending from the valve, spring means associated with the rod for urging the rod in a direction removing the valve from the ports, trip means for the rod, the upper portion of the barrel being provided with longitudinal slots, 2. cross member slidable in the'slots and through which the rod is slidable, said spring means consisting of a coiled compressible spring on the rod, a collar on the upper end of the rod, said spring being interposed between the cross member and the collar.

HARRY G. CAMPBELL. 

